There are past and present public debates over certain aspects of climate change: how much has occurred in modern times, what causes it, what its effects will be, and what action should be taken to curb it now or later, and so forth. In the scientific literature, there is a very strong consensus that global surface temperatures have increased in recent decades and that the trend is caused by human-induced emissions of greenhouse gases. The controversies are, by now, mostly political rather than scientific: there is a scientific consensus that global warming is happening and is caused by human activity. Public debates that also reflect scientific debate include estimates of how responsive the climate system might be to any given level of greenhouse gases (climate sensitivity). Disputes over the key scientific facts of global warming are more prevalent in the media than in the scientific literature, where such issues are treated as resolved, and such disputes are more prevalent in the United States and Australia than globally.

Debates around details in the science

There have been many debates around the details of climate change science. Climate change deniers and "skeptics" tend to cherry-pick data or studies, and then trump up any scientific discussions or apparent discrepancies that match with their agenda. Many of those apparent discrepancies have been reconciled in the meantime, climate models have become more accurate, the scientific consensus on climate change has strengthened and so forth. For example, climatologist Kevin E. Trenberth has published widely on the topic of climate variability and has exposed flaws in the publications of other scientists. For past debates and controversies on scientific details see for example:

Debates over most effective response to warming

There have been debates on the best responses to slow global warming, and their timing. The debates are around the specific actions for climate change mitigation and climate change adaptation, or climate action in general. See for example: